Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/12896
Reviving after a hiatus. Updated since tags. I've actually recently come
across a number of users hitting this issue in production and are unable to use
ALS with cross-validation as a result.
Added [SPARK-19345](https://issues.apache.org/jira/browse/SPARK-19345) for
adding detail to the docs / examples and
[SPARK-19346](https://issues.apache.org/jira/browse/SPARK-19346) for adding the
advanced strategies discussed above.
ping @sethah @srowen @jkbradley in case you have any more comment. I'll
merge in a day or two if no major comments.
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